Group ConnectToApplication-related info into a params struct.

mojo/shell/capability_filter.h

Index: mojo/shell/capability_filter.h
diff --git a/mojo/shell/capability_filter.h b/mojo/shell/capability_filter.h
index 16a55c245d3d5bc16e89b769971ed8a919b2e7f8..2d0ef85442276e130bccc7fec9f756f1becbe364 100644
--- a/mojo/shell/capability_filter.h
+++ b/mojo/shell/capability_filter.h
@@ -13,6 +13,8 @@
 namespace mojo {
 namespace shell {
 
+struct Identity;
+
 // A set of names of interfaces that may be exposed to an application.
 using AllowedInterfaces = std::set<std::string>;
 // A map of allowed applications to allowed interface sets. See shell.mojom for
@@ -23,6 +25,11 @@ using CapabilityFilter = std::map<std::string, AllowedInterfaces>;
 // other application and any service exposed by other applications.
 CapabilityFilter GetPermissiveCapabilityFilter();
 
+// Returns the set of interfaces that an application instance with |filter| is
+// allowed to see from an instance with |identity|.
+AllowedInterfaces GetAllowedInterfaces(const CapabilityFilter& filter,
+                                       const Identity& identity);
+
 }  // namespace shell
 }  // namespace mojo